复合组件（EditText输入内容，显示图片，点击图片删除输入内容，点击button弹出输入的内容）

来源：互联网发布：阿里云可以干嘛编辑：程序博客网时间：2024/05/18 08:55

### main布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="vertical"        tools:context="com.example.my.MainActivity">    <com.example.my.MyText        android:id="@+id/main_tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="复合组件"        />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="btn"        android:text="按钮"        /></LinearLayout>

### textview布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content">    <EditText        android:id="@+id/tv"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text=""        />    <ImageView        android:id="@+id/img"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="@drawable/base_tabpager_indicator_selected"        android:layout_alignRight="@+id/tv"        android:visibility="gone"        /></RelativeLayout>

### 新建一个类MyText 继承 Relativelayout

public class MyText extends RelativeLayout {    private ImageView imageView;    private EditText editText;//    public MyText(Context context, AttributeSet attrs) {        super(context, attrs);        //导入布局//        LayoutInflater.from(context).inflate(R.layout.textview_layout, this, true);        LayoutInflater.from(context).inflate(R.layout.textview_layout, this, true);        imageView = (ImageView) findViewById(R.id.img);        editText = (EditText) findViewById(R.id.tv);        imageView.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                editText.setText("");            }        });        editText.addTextChangedListener(new TextWatcher() {            @Override            public void beforeTextChanged(CharSequence s, int start, int count, int after) {            }            @Override            public void onTextChanged(CharSequence s, int start, int before, int count) {            }            @Override            public void afterTextChanged(Editable s) {                if (editText.length() == 0) {                    imageView.setVisibility(INVISIBLE);                } else {                    imageView.setVisibility(VISIBLE);                }            }        });    }}

### MainActivity

public class MainActivity extends AppCompatActivity {    private EditText et;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        et = (EditText) findViewById(R.id.tv);    }    public void btn(View view) {        Toast.makeText(MainActivity.this, et.getText(), 0).show();    }}

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