安卓常用控件监听事件

有勇气的牛排 1084 安卓 2021-10-17 00:47:33

< RelativeLayout  xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}" >

   < TextView
        android:id="@+id/One"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="One"
        tools:ignore="MissingConstraints"
        tools:layout_editor_absoluteX="104dp"
        tools:layout_editor_absoluteY="116dp" />


    < EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="7dp"
        android:layout_marginTop="32dp"
        android:ems="10"
        android:text="输入用户名">


    < /EditText>

    < EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="19dp"
        android:ems="10"
        android:text="密码" />

    < Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText2"
        android:layout_marginLeft="243dp"
        android:text="Button" />

< /RelativeLayout>

TextView textView1;
EditText edit1;
EditText edit2;
Button btn1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    textView1 = findViewById(R.id.One);
    edit1 = (EditText) findViewById(R.id.editText1);
    edit2 = (EditText) findViewById(R.id.editText2);
    btn1 = (Button) findViewById(R.id.button1);

    btn1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            String username = edit1.getText().toString();
            String password = edit2.getText().toString();

            textView1.setText(username);
            textView1.setTextColor(Color.RED);
            textView1.setTextSize(20);

        }
    });

}

<pre><div class="hljs"><code class="lang-html">< RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="${relativePackage}.${activityClass}" > < TextView android:id="@+id/One" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:text="One" tools:ignore="MissingConstraints" tools:layout_editor_absoluteX="104dp" tools:layout_editor_absoluteY="116dp" /> < EditText android:id="@+id/editText1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_marginLeft="7dp" android:layout_marginTop="32dp" android:ems="10" android:text="输入用户名"> < /EditText> < EditText android:id="@+id/editText2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/editText1" android:layout_marginTop="19dp" android:ems="10" android:text="密码" /> < Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/editText2" android:layout_marginLeft="243dp" android:text="Button" /> < /RelativeLayout> </code></div></pre> <pre><div class="hljs"><code class="lang-java">TextView textView1; EditText edit1; EditText edit2; Button btn1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView1 = findViewById(R.id.One); edit1 = (EditText) findViewById(R.id.editText1); edit2 = (EditText) findViewById(R.id.editText2); btn1 = (Button) findViewById(R.id.button1); btn1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { String username = edit1.getText().toString(); String password = edit2.getText().toString(); textView1.setText(username); textView1.setTextColor(Color.RED); textView1.setTextSize(20); } }); } </code></div></pre>

安卓 常用控件 监听 事件

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安卓常用控件监听事件