Grid View 自定义布局

Grid View 自定义布局

1.   选择 Grid View 的布局位置
2.   自定义Adapter
3.   设置数据




public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        GridView gv = (GridView) findViewById(R.id.gv);
        gv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                TextView tv = (TextView) view.findViewById(R.id.grid_textview);
                String s = tv.getText().toString();
                Toast.makeText(MainActivity.this, s, Toast.LENGTH_SHORT).show();
            }
        });
        imgAdapter imgadapter = new imgAdapter();
        gv.setAdapter(imgadapter);
    }

    class imgAdapter extends BaseAdapter {
        public int getCount() {
            return mThumbIds.length;
        }

        public Object getItem(int position) {
            return null;
        }

        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View v = LayoutInflater.from(getApplication()).inflate(R.layout.gridview, null);
            ImageView iv = (ImageView) v.findViewById(R.id.grid_img);
            TextView tv = (TextView) v.findViewById(R.id.grid_textview);
            iv.setImageResource(mThumbIds[position]);
            tv.setText(getString(mThumbIds[position]));
            return v;
        }

        private Integer[] mThumbIds = {
                R.drawable.sample_2, R.drawable.sample_3,
                R.drawable.sample_4, R.drawable.sample_5,
                R.drawable.sample_6, R.drawable.sample_7,
                R.drawable.sample_0, R.drawable.sample_1,
                R.drawable.sample_2, R.drawable.sample_3,
                R.drawable.sample_4, R.drawable.sample_5,
                R.drawable.sample_6, R.drawable.sample_7,
                R.drawable.sample_0, R.drawable.sample_1,
                R.drawable.sample_2, R.drawable.sample_3,
                R.drawable.sample_4, R.drawable.sample_5,
                R.drawable.sample_6, R.drawable.sample_7
        };
    }
}


Activity 布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.e560.m1026gridview.MainActivity">

    <GridView
        android:id="@+id/gv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:columnWidth="90dp"
        android:numColumns="auto_fit"
        android:verticalSpacing="10dp"
        android:horizontalSpacing="10dp"
        android:stretchMode="columnWidth"
        android:gravity="center"
        />
</RelativeLayout>


自定义布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

        <ImageView
            android:id="@+id/grid_img"
            android:layout_width="400dp"
            android:layout_height="140dp"
            android:background="#CCCCCC" />

        <TextView
            android:id="@+id/grid_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#FFCCCC"
            android:textSize="20dp" />

</RelativeLayout>

Android 生命周期

Android 生命周期



第一次启动
MainActivity: --1--onCreate
MainActivity: --2--onStart
MainActivity: --3--onResume

跳到其他Activity
MainActivity: --4--onPause
MainActivity: --9--onSaveInstanceState
MainActivity: --5--onStop

返回键返回
MainActivity: --6--onRestart
MainActivity: --2--onStart
MainActivity: --3--onResume

接电话
MainActivity: --4--onPause
MainActivity: --9--onSaveInstanceState  有延迟

挂电话
MainActivity: --3--onResume

按返回键推出到Android界面
MainActivity: --4--onPause
MainActivity: --5--onStop
MainActivity: --7--onDestroy

重新启动
MainActivity: --1--onCreate
MainActivity: --2--onStart
MainActivity: --3--onResume

旋转屏幕
MainActivity: --4--onPause
MainActivity: --9--onSaveInstanceState
MainActivity: --5--onStop
MainActivity: --7--onDestroy
MainActivity: --1--onCreate
MainActivity: --2--onStart
MainActivity: --8--onRestoreInstanceState
MainActivity: --3--onResume

按Home键
MainActivity: --4--onPause
MainActivity: --9--onSaveInstanceState
MainActivity: --5--onStop

按APP图标开启
MainActivity: --6--onRestart
MainActivity: --2--onStart
MainActivity: --3--onResume

按Power键，关屏幕
MainActivity: --4--onPause
MainActivity: --9--onSaveInstanceState
MainActivity: --5--onStop

按Power键，开屏幕
MainActivity: --6--onRestart
MainActivity: --2--onStart
MainActivity: --3--onResume

按方块键
MainActivity: --4--onPause
MainActivity: --9--onSaveInstanceState
MainActivity: --5--onStop

按方块键，重新回到App
MainActivity: --6--onRestart
MainActivity: --2--onStart
MainActivity: --3--onResume



public class MainActivity extends AppCompatActivity {
    private final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i(TAG, "--1--onCreate");

        Button bt = (Button) findViewById(R.id.button);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, NewActivity.class);
                startActivity(intent);
            }
        });
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, "--2--onStart");
    }

    @Override
    protected void onResume() {
        super.onResume();
        Log.i(TAG, "--3--onResume");
    }

    @Override
    protected void onPause() {
        super.onPause();
        Log.i(TAG, "--4--onPause");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.i(TAG, "--5--onStop");
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        Log.i(TAG, "--6--onRestart");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.i(TAG, "--7--onDestroy");
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        Log.i(TAG, "--8--onRestoreInstanceState");
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        Log.i(TAG,"--9--onSaveInstanceState");
    }
}

ListFragment 和自定义布局Layout

ListFragment 和自定义布局Layout

public class ListFrag extends ListFragment {

    public myadaputer adapter;
    public List<String> data;

    public void setData(List<String> data) {
        this.data = data;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        adapter = new myadaputer();
        adapter.setDate(getdata());
    }

    public List<String> getdata(){
        Bundle ig = getArguments();
        int size = ig.getInt("size");
        List<String> x = new ArrayList<String>();
        for(int i=0;i< size ;i++) {
            x.add("add" + i);
        }
        return x;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.listfrag_layout, null);
        setListAdapter(adapter);
        return view;
    }

    @Override
    public void onPause() {
        super.onPause();
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);
        Toast.makeText(getActivity(), "onListItemClick", Toast.LENGTH_SHORT).show();
    }

    class myadaputer extends BaseAdapter {
        private List<String> data;
        public void setDate(List<String> data) {
            this.data = data;
        }

        @Override
        public int getCount() {
            return data.size();
        }

        @Override
        public Object getItem(int position) {
            return data.get(position);
    }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view = null;
            if(convertView == null){
                view = LayoutInflater.from(getActivity()).inflate(R.layout.listview,null);
            }else{
                view = convertView;
            }
            TextView tv = (TextView) view.findViewById(R.id.textView);
            tv.setText(data.get(position).toString());
            return view;
        }
    }


}

Java 回调

Java 回调


import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        for(int i=0; i < 10; i++){
            System.out.print(i);
        }

        ////////////////////////////////////
        new Thread(new Runnable(){
            public void run(){
                Test t = new Test();
                t.relist(new Test.CallBack(){
                     public void getdata(List<String> list){
                         System.out.println(list);
                     }
                });
            }
        }).start();
        ///////////////////////////////////
       
        ///////////////////////////////////
        // Test t = new Test();
        //         t.relist(new Test.CallBack(){
        //              public void getdata(List<String> list){
        //                  System.out.println(list);
        //              }
        //         });
        ///////////////////////////////////

        for(int i=0; i < 10; i++){
            System.out.print(i);
        }
    }
}


class Test{
    private List<String> ls;
    public interface CallBack{
        public void getdata(List<String> list);
    }
   
    public void relist(CallBack calback){
        ls = new ArrayList<String>();
        for(int i = 0; i< 10; i++){
            ls.add("add" + i);
        }
        calback.getdata(ls);
    }
}


https://paiza.io/projects/HaU5z4cE88fPD8xvSeUznA

在MainActivity内调用Fragment内的控件并实现方法

在MainActivity内调用Fragment内的控件，
并在MainActivity内实现Fragment内的控件的方法

MainActivety.java

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private FragmentManager fragmentManager;
    private FragmentTransaction fragmentTransaction;
    private xxx x;
    private vvv v;
    private EditText xet ,vet;
    private Button xbt, vbt;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        fragmentManager = getFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        x = new xxx();
        v = new vvv();
        fragmentTransaction.add(R.id.vvv, v, "fv");
        fragmentTransaction.add(R.id.xxx, x, "fx");
        fragmentTransaction.commit();
    }

    @Override
    protected void onStart() {
        super.onStart();
        xbt = (Button) x.getView().findViewById(R.id.xxxbutton);
        vbt = (Button) v.getView().findViewById(R.id.vvvbutton);
        xbt.setOnClickListener(this);
        vbt.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        vet = (EditText) v.getView().findViewById(R.id.vvveditText);
        xet = (EditText) x.getView().findViewById(R.id.xxxeditText);

        switch(view.getId()){
            case R.id.vvvbutton:
                if(vet != null) {
                    vet.setText(xet.getText().toString());
                    System.out.println(vet);
                }
                break;

            case R.id.xxxbutton:
                if(xet != null) {
                    xet.setText(vet.getText().toString());
                    System.out.println(xet);
                }
                break;
            default:
                break;
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/activity_main"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="horizontal"

    tools:context="com.example.java.m1020a.MainActivity">

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_weight="1"

        android:id="@+id/xxx"

        android:orientation="vertical"

        ></LinearLayout>

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_weight="1"

        android:id="@+id/vvv"

        android:orientation="vertical"

        ></LinearLayout>

</LinearLayout>

vvv.java

xxx.java

public class vvv extends Fragment {

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

    }

    @Nullable

    @Override

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View v = inflater.inflate(R.layout.fvvv, null);

        return v;

    }

    @Override

    public void onPause() {

        super.onPause();

    }

}

fvvv.xml

fxxx.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical">

    <EditText

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:inputType="textPersonName"

        android:text="fv"

        android:ems="10"

        android:id="@+id/vvveditText" />

    <Button

        android:text="fvvv"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/vvvbutton" />

</LinearLayout>

在MainActivity 调用 Fragment 的控件

在MainActivity 调用代码方式加载的 Fragment 内的控件。


public class MainActivity extends AppCompatActivity {

    private FragmentManager fm;
    private FragmentTransaction ft;
    private Button bt;
    private Fraga fa;
    @Override
//加载Fragment
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        fm = getFragmentManager();
        ft = fm.beginTransaction();
        fa = new Fraga();
        ft.add(R.id.fraga, fa, "fa");
        ft.commit();
    }

    @Override
    protected void onStart() {
        super.onStart();
        // 获得Fragment的控件
        Button bt = (Button) fa.getView().findViewById(R.id.button);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                TextView tv = (TextView) fa.getView().findViewById(R.id.textView);
                tv.setText("MainActivity");
            }
        });

    }
}

//如果在onCreate方法中去获取Fragment的控件，可能因Fragment

被加载之前调用 getView 方法，会出空指针错误。

Java 接口回调

Java 接口回调


import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws Exception {

    for(int l = 0; l < 9 ; l++){
        System.out.println(l);
        BBQ b = new BBQ();
        b.XBBQ(new BBQ.CallBack(){
            @Override
            public void getstring(int s){
                System.out.println("iii->" + s );
            }
        });

    }
    }
}


class BBQ{
    private int i;
    public void XBBQ(CallBack callback){
        new Thread(new Runnable(){
            public void run(){
                for(i=0; i< 99090999; i++){
                   
                }
                callback.getstring(i);
            }
        }).start();
    }
   
   
    public interface CallBack{
        public void getstring(int s);
    }
}

https://paiza.io/projects/8cAVqtuJtHQwgWq0mPJZkg