package xatu.cn.androidtest_one;
import android.content.ContentResolver;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import java.io.FileNotFoundException;
/*
从手机相册中选择一幅图片并显示在屏幕上
*/
public class MainActivity extends AppCompatActivity {
private Button btn_choose;
private ImageView img_show;
private final int REQUEST_PICTURE_CHOOSE = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
event();
}
private void init() {
btn_choose = findViewById(R.id.btn_choose_picture);
img_show = findViewById(R.id.imgview_src);
}
private void event() {
btn_choose.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_PICK);
startActivityForResult(intent, REQUEST_PICTURE_CHOOSE);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK){
Uri uri = data.getData();
Log.e("uri", uri.toString());
ContentResolver cr = this.getContentResolver();
try {
Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
ImageView imageView = (ImageView) findViewById(R.id.imgview_src);
/* 将Bitmap设定到ImageView */
imageView.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
super.onActivityResult(requestCode, resultCode, data);
}
}
页面布局代码：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/btn_choose_picture"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="选择图片" />
<ImageView
android:id="@+id/imgview_src"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
